While the boy ______ down the street, the UFO _____ .

It was the end of the year party at school .I had asked my mother to __36__us cookies .Mom’s chocolate chios were the best .
But two o’clock passed, and she didn’t   37 .Most of the other mothers had come and gone , dropping off their cookies , chips and cupcakes . I took my bag and left   38  my home . The house was empty when I arrived . My heart was    39  anger.For the first time in my life ,my mother had let me down .
I was lying on my bed upstairs   40  I heard her come through the front door .“Robbie,”she called out .“Where are you ?” I could hear her running from room to room . She was looking for me .I kept silent .When she entered my room and sat beside me on my bed , I didn’t move .“I’m sorry , honey ,” she said .“I got busy and forgot .” I still kept __41__.
Then my mother began to laugh .I couldn’t believe ___42___.I rolled over (翻身)and faced her .
But my mother wasn’t laughing at all . She was crying . “I’m so sorry . I let my boy down .”
She cried like a little girl. I had never __43__my mother cry .
“It’s OK , Mom ,”I reached out and stroked （撫摸）her hair .“We didn’t even need those ___44___.” There was plenty of stuff to eat .Don’t  cry It’s all right.”
My ____45__made my mother sit up . She pulled me to her . We didn’t say another word .We just held each other in a long hug .

While the boy ______ down the street, the UFO _____ .